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[LadyZaziki]

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[xentropa]

Typically, once you power up your PC, the bios is set to copy paste a designated chunk of data off a storage device to the RAM.  That is what is happening during the loading screen.  Once all the data has been copied to the RAM, then the program begins.

[pipnina]

2 minutes ago, LadyZaziki said:

Hi Linus Techtips community,

I need to know how a Pc running Windows 10 boots in Detail (Pressing the start button, what happens after that inside of the PC, and the focus should be on the Windows part of things).

There is only one problem, I don´t really know how to do research for it.

I´m only finding articles about how to make Windows boot faster.

Can anyone of you help me to find some good search terms?

 

Thanks in advance

When the computer turns on (aka you press the power button) the BIOS checks the "boot sector" of all the connected storage devices in the order defined in the bios settings.

 

On the first drive the BIOS finds the hexadecimal code "AA55" at offset 510 (so if the 511th and 512th bytes on the disk equal AA55) the BIOS runs any code written in bytes 0-510 in the drive. This is all running on the CPU in 16-bit mode.

 

The code in this area is mainly used to tell the CPU to execute code written elsewhere on the disk, because of the extremely limited storage in the boot sector.

 

After this point, the running code (windows) will ask the CPU to switch to 32-bit or 64-bit mode and begin loading the operating system's files to memory.

 

The exact procedure after that point probably isn't known outside of Microsoft's windows division.

[BloodyWaters]

1. Press power button

2. Mobo boots up RAM, CPU, hard drive, GPU and others. 

3. Mobo brand name pops up on screen while it loads windows boot files from HDD to RAM. 

4. Once vital windows files are on RAM, Mobo executes those files and goes to windows loading screen. 

5. While loading, windows configures hardware and loads files for the desktop and users to RAM. 

6. Windows finishes and goes to login screen. 

7. After user login, windows loads user-specific files to RAM. (That's why windows can be slow right when you arrive at desktop.)

8. Boot process finished. 

[JoostinOnline]

2 minutes ago, BloodyWaters said:

1. Press power button

2. Mobo boots up RAM, CPU, hard drive, GPU and others. 

3. Mobo brand name pops up on screen while it loads windows boot files from HDD to RAM. 

4. Once vital windows files are on RAM, Mobo executes those files and goes to windows loading screen. 

5. While loading, windows configures hardware and loads files for the desktop and users to RAM. 

6. Windows finishes and goes to login screen. 

7. After user login, windows loads user-specific files to RAM. (That's why windows can be slow right when you arrive at desktop.)

8. Boot process finished. 

I'm actually going to have to correct you there

1. Press power button
2. A virgin is sacrificed
3. Magic
4. Windows logo

[BloodyWaters]

1 hour ago, JoostinOnline said:

I'm actually going to have to correct you there

1. Press power button
2. A virgin is sacrificed
3. Magic
4. Windows logo

I can't believe I forgot that!!!